ALL players of the OPSL are required to have an OASA Player Card and must in good standing with this organization in order to participate on any of the teams in the league. Player Cards are available from their website. All fees associated with the player card are the responsibility of the player.

The Oregon Adult Soccer Association (OASA) is a private, non-profit 501(c) (3) corporation organized to promote adult soccer in Oregon. OASA is affiliated with the United States Adult Soccer Association (USASA), the United State Soccer Federation (USSF) and the Federation Internationale de Football Association (FIFA).